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Publication:
Simulated stability of the Atlantic Meridional Overturning Circulation during the Last Glacial Maximum

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cris.virtual.author-orcid0000-0002-6072-0224
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
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cris.virtualsource.author-orcidfe33f7b8-070c-4afa-8e13-c2774a640576
cris.virtualsource.author-orcid9804ce15-23ad-4cad-b7a7-1fc8c5205cba
cris.virtualsource.author-orcide442bd30-6177-4127-ac53-a18189b68a89
cris.virtualsource.author-orcid46d13f97-a7ed-4563-b9ac-ba3a7ef16c50
dc.contributor.authorPöppelmeier, Frerk
dc.contributor.authorScheen, Jeemijn
dc.contributor.authorJeltsch-Thömmes, Aurich Tuure Don
dc.contributor.authorStocker, Thomas
dc.date.accessioned2024-09-21T15:52:06Z
dc.date.available2024-09-21T15:52:06Z
dc.date.issued2021-03-11
dc.description.abstractThe response of the Atlantic Meridional Overturning Circulation (AMOC) to freshwater perturbations critically depends on its mean state. Large swaths of icebergs melting in the North Atlantic during the last deglaciation constituted such perturbations and can, thus, provide important constraints on the stability of the AMOC. However, the mean AMOC state during the Last Glacial Maximum (LGM), preceding the rapid disintegration of the ice sheets during the deglaciation, as well as its response to these perturbations remain debated. Here, we investigate the evolution of the AMOC as it responds to freshwater perturbations under improved LGM boundary conditions in the Bern3D intermediate complexity model. Particularly, we consider the effect of an open versus a closed Bering Strait and the effect of increased tidal dissipation as a result of the altered bathymetry due to the lower glacial sea level stand. The vigorous and deep AMOC under these glacial boundary conditions, consistent with previous simulations with different models, reacts more strongly to North Atlantic freshwater forcings than under preindustrial conditions. This increased sensitivity is mostly related to the closed Bering Strait that cuts off the freshwater escape route through the Arctic into the Pacific, thereby facilitating faster accumulation of freshwater in the North Atlantic and halting deep-water formation. Proxy reconstructions of the LGM AMOC instead indicate a weaker and possibly shallower AMOC than today, which is in conflict with the particularly strong and deep circulation states coherently simulated with ocean circulation models for the LGM. Simulations with reduced North Atlantic deep-water formation, as a consequence of potentially increased continental runoff from ice sheet melt and imposed changes in the hydrological cycle, more closely resemble the overturning circulation inferred from proxies. These circulation states also show bistable behavior, where the AMOC does not recover after North Atlantic freshwater hosing. However, no AMOC states are found here that either comprise an extreme shoaling or vigorous and concurrent shallow overturning as previously proposed based on paleoceanographic data.
dc.description.numberOfPages18
dc.description.sponsorshipPhysikalisches Institut, Klima- und Umweltphysik (KUP)
dc.identifier.doi10.48350/155446
dc.identifier.doi10.48350/155446
dc.identifier.publisherDOI10.5194/cp-17-615-2021
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/45523
dc.language.isoen
dc.publisherCopernicus Publications
dc.relation.ispartofClimate of the past
dc.relation.issn1814-9324
dc.relation.organizationDCD5A442BF29E17DE0405C82790C4DE2
dc.relation.organizationDCD5A442C08FE17DE0405C82790C4DE2
dc.relation.organizationDCD5A442C44AE17DE0405C82790C4DE2
dc.subject.ddc500 - Science::530 - Physics
dc.subject.ddc500 - Science::550 - Earth sciences & geology
dc.titleSimulated stability of the Atlantic Meridional Overturning Circulation during the Last Glacial Maximum
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage632
oaire.citation.issue2
oaire.citation.startPage615
oaire.citation.volume17
oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
oairecerif.author.affiliation2#PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation2Physikalisches Institut
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oairecerif.author.affiliation2#PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation3#PLACEHOLDER_PARENT_METADATA_VALUE#
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unibe.contributor.rolecreator
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unibe.contributor.rolecreator
unibe.date.licenseChanged2021-04-14 07:13:40
unibe.description.ispublishedpub
unibe.eprints.legacyId155446
unibe.journal.abbrevTitleCLIM PAST
unibe.refereedTRUE
unibe.subtype.articlejournal

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